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- ISBN: 9781570917929 | 1570917922
- Cover: Paperback
- Copyright: 2/1/2012
Xaxon Yellowbearyd was the fiercest Viking warrior of his time. Now a map to his hidden treasure lies in Radius and Per's hands. Together the cousins must decode the strange numbered grid on the map--and figure out the secret of the Viking's X and Y axes. Full color.